it is possible to perform a privilege escalation attack due to a lack of
permissions check in the group creation process. A malicious user could
exploit this vulnerability to take control of every group (change name,
description, avatar and settings).
To exploit this vulnerability you have to follow these steps:
1) Create a cookie named bp_new_group_id=<id_of_victim_group>
2) Visit the url http://example.com/groups/create/step/group-details/
3) Enjoy the power